vintage motor
Join Date: Sep 2008
Location: Tepic, Nayarit, Mexico
Posts: 1,605
Bikes: 48 Automoto, 49 Stallard, 50 Rotrax, 62 Jack Taylor, 67 Atala, 68 Lejeune, 72-74-75 Motobecanes, 73 RIH, 71 Zieleman, 74 Raleigh, 78 Windsor, 83 Messina (Villata), 84 Brazzo (Losa), 85 Davidson, 90 Diamondback, 92 Kestrel
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Jean-Paul Routens (JPR) made a 2-bolt seatpost that adjusts with allen wrenches from the bottom side. You can have your cake and eat it too: it's much easier to adjust than the Campagnolo-style posts, while being micro-adjustable and holding the saddle firmly in place. The JPR 3000 is from the mid-1970's I believe, and they also made a similar 3001 fluted model. I have one on my '75 Moto Grand Jubile and it is my favorite seatpost.
If you want something more period-correct, Ideale made an all-steel micro-adjusting clamp that mounts to a standard straight-tube seatpost. I have one on my ´62 Jack Taylor and it has worked very well: micro-adjustable, easy to adjust and no slippage.